package com.da.boot.interceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import lombok.extern.slf4j.Slf4j;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

/**
 * @author JokerDa.
 * @date 2021/1/23 14:35
 * Description:  登录检查
 * * 1、配置好拦截器要拦截哪些请求
 * * 2、把这些配置放在容器中
 */

@Slf4j
public class LoginInterceptor implements HandlerInterceptor {
    /**
     * 目标方法执行之前
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
        throws Exception {
        //登录检查逻辑
        HttpSession session = request.getSession();
        Object loginUser = session.getAttribute("loginUser");
        if (loginUser != null) {
            //放行
            return true;
        }
        //拦截住。未登录。跳转到登录页
        request.setAttribute("msg", "请先登录");
        //response.sendRedirect("/");
        request.getRequestDispatcher("/").forward(request, response);
        return false;
    }

    /**
     * 目标方法执行完成以后
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
                           ModelAndView modelAndView) throws Exception {
        //log.info("postHandle执行{}", modelAndView);
    }

    /**
     * 页面渲染以后
     */
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
        throws Exception {
        //log.info("afterCompletion执行异常{}", ex);
    }
}
